Modulation methods and apparatus for reducing common mode noise

Details Modulation methods and apparatus for reducing common mode noise Modulation methods and apparatus for reducing common mode noise

2008-07-15

2008-07-15

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

C363S132000

Reexamination Certificate

active

07400518

ABSTRACT:
A method and apparatus for reducing common mode noise in a three phase pulse width modulated (PWM) system the method comprising the steps of receiving modulating waveforms, identifying a first of the modulating waveforms that is instantaneously the maximum of the modulating waveforms, identifying a second of the modulating waveforms that is instantaneously the minimum of the modulating waveforms, for a first phase associated with at least one of the first and second identified waveforms, substituting a first substitute waveform for the one of the first and second waveforms, for the first phase, modifying at least one of the first substituted waveform and duty cycle signals generated by comparing the first substituted waveform with the carrier signal as a function of a first rule set to substantially minimize the effects of turn on delays and for at least one of the second and third phases, modifying at least one of the associated modulating waveform and duty cycle signals generated by comparing the modulating waveform with the carrier signal as a function of a second rule set to substantially eliminate the effects of turn on delays where the second rule set is different than the first rule set.

REFERENCES:
patent: 4994951 (1991-02-01), Iwasa et al.
patent: 5625550 (1997-04-01), Leggate et al.
patent: 5850132 (1998-12-01), Garces
patent: 6469916 (2002-10-01), Kerkman et al.
patent: 6477067 (2002-11-01), Kerkman et al.

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